2020 census

The 2020 United States census counted 90 people, 41 households, and 19 families in Piqua.^[8][9] The population density was 22.7 per square mile (8.8/km²). There were 43 housing units at an average density of 10.8 per square mile (4.2/km²).^[9][10] The racial makeup was 91.11% (82) white or European American (90.0% non-Hispanic white), 0.0% (0) black or African-American, 0.0% (0) Native American or Alaska Native, 0.0% (0) Asian, 0.0% (0) Pacific Islander or Native Hawaiian, 0.0% (0) from other races, and 8.89% (8) from two or more races.^[11] Hispanic or Latino of any race was 5.56% (5) of the population.^[12]

Of the 41 households, 14.6% had children under the age of 18; 31.7% were married couples living together; 34.1% had a female householder with no spouse or partner present. 46.3% of households consisted of individuals and 24.4% had someone living alone who was 65 years of age or older.^[9] The average household size was 4.5 and the average family size was 4.5.^[13] The percent of those with a bachelor’s degree or higher was estimated to be 15.6% of the population.^[14]

21.1% of the population was under the age of 18, 4.4% from 18 to 24, 17.8% from 25 to 44, 24.4% from 45 to 64, and 32.2% who were 65 years of age or older. The median age was 53.0 years. For every 100 females, there were 95.7 males.^[9] For every 100 females ages 18 and older, there were 97.2 males.^[9]